Open space easement for 978-acre Sonoma Mountain ranch

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Scenic hillsides, rolling grasslands, and oak woodlands on a large swath of Sonoma Mountain gained protection last week when the Sonoma County Board of Supervisors approved $3.092 million in public funds to acquire a conservation easement over the Donnell Ranch.

“The Donnell Ranch is one of the most scenic properties in our region – it’s a gateway to our county,” said First District Supervisor and Ag + Open Space Director, Susan Gorin. “The ranch has it all – beautiful rolling hillsides, untouched natural areas, and ample space for grazing livestock. I’m so pleased we were able to work with the Donnell family to protect this iconic property.”

Known as the Gravelly Lake conservation easement, owned by the Bruce Donnell family, the 978-acre property is located at the top and eastern-facing hillsides of southern Sonoma Mountain, and includes several intermittent headwater streams draining to San Pablo Bay, two sag ponds along the Rogers Creek Fault, and significant natural habitat that will allow for wildlife movement between Sonoma Mountain and the baylands, the historic lands around the bay that were under water before they were diked.

The ranch rises from the valley floor, reaching an elevation of almost 1,000 feet above sea level to provide an open backdrop to the southwest end of Sonoma Valley. The iconic view of rolling grasslands and oak woodlands is visible from Sonoma Valley, Highway 121 and Highway 12, and State Route 37, as well as the adjacent Tolay Lake Regional Park.

Aside from some irrigation, fencing and a few ranch roads, there are no structures or any other improvements on the property. Approximately 67 acres of planted vineyard are located at the lower elevations, and much of the rest of the property is used for cattle grazing. While the easement protects the scenic and natural resources on the property, it also allows for recreational and educational opportunities, residential use, grazing and agricultural cultivation.

The ranch is adjacent to Tolay Lake Regional Park, and combined with the protection of the Gravelly Lake easement the two properties help to form a system of protected land along southern Sonoma Mountain that spans into the wetland areas of the San Pablo Bay National Wildlife Refuge.

“Thanks to landowners like the Donnell Family and the partnership between Sonoma Land Trust and the Ag + Open Space District, the scenic backdrop to Tolay Lake Regional Park will be protected forever,” said Wendy Eliot, SLT conservation director.

Public access to the property, however, will be limited. “The easement does require at least two guided outings per year, but those will be at the landowner’s discretion,” said Amy Ricard, Community Relations Specialist for Ag + Open Space.

“What the public receives in lieu of access is beautiful hillsides free from subdivision and development, untouched habitat that will filter our water and sequester carbon on our behalf, and the maintenance of the rural landscape and our sense of place.”

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